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我创建了一个 PDF 上下文，上下文保存在文件中。
为现有的pdf上下文绘制不同的上下文？

pdfContext -> viewContext

我的代码：

void myCreatePDFFile(CGRect pageRect, const char *fileName){

CGContextRef pdfContext;
CFStringRef pathPDF;
CFURLRef urlPDF;
CFDataRef dataPDF;
CFMutableDictionaryRef myDictionary;
CFMutableDictionaryRef pageDictionary;

// Creates a CFString object from a filename passed to the function MyCreatePDFFile.
pathPDF = CFStringCreateWithCString(kCFAllocatorDefault,
                                    fileName,
                                    kCFStringEncodingUTF8);

// Creates a CFURL object from the CFString object.
urlPDF = CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
                                       pathPDF,
                                       kCFURLPOSIXPathStyle,
                                       false);

CFRelease(pathPDF);

// Creates an empty CFDictionary object to hold metadata. The next two lines add a title and creator. You can add as many key-value pairs as you’d like using the function CFDictionarySetValue. For more information on creating dictionaries, see CFDictionary Reference .
myDictionary = CFDictionaryCreateMutable(kCFAllocatorDefault,
                                         0,
                                         &kCFTypeDictionaryKeyCallBacks,
                                         &kCFTypeDictionaryValueCallBacks);

CFDictionarySetValue(myDictionary, kCGPDFContextTitle, CFSTR("My PDF File"));
CFDictionarySetValue(myDictionary, kCGPDFContextCreator, CFSTR("TESTer"));

/* Creates a PDF graphics context, passing three parameters:
 ● A CFURL object that specifies a location for the PDF data.
 ● A pointer to a rectangle that defines the default size and location of the PDF page. The origin of the rectangle is typically (0, 0). Quartz uses this rectangle as the default bounds of the page media box. If you pass NULL, Quartz uses a default page size of 8.5 by 11 inches (612 by 792 points).
 ● A CFDictionary object that contains PDF metadata. Pass NULL if you don’t have metadata to add. You can use the CFDictionary object to specify output intent options—intent subtype, condition, condition identifier, registry name, destination output profile, and a human-readable text string that contains additional information or comments about the intended target device or production condition. For more information about output intent options, see CGPDFContext Reference .
 */
pdfContext = CGPDFContextCreateWithURL(urlPDF, &pageRect, myDictionary);

CFRelease(myDictionary);
CFRelease(urlPDF);

// Creates a CFDictionary object to hold the page boxes for the PDF page. This example sets the media box.
pageDictionary = CFDictionaryCreateMutable(kCFAllocatorDefault,
                                           0,
                                           &kCFTypeDictionaryKeyCallBacks,
                                           &kCFTypeDictionaryValueCallBacks);

dataPDF = CFDataCreate(kCFAllocatorDefault,
                       (const UInt8 *)&pageRect,
                        sizeof(pageRect));

CFDictionarySetValue(pageDictionary, kCGPDFContextMediaBox, dataPDF);

// Signals the start of a page. When you use a graphics context that supports multiple pages (such as PDF), you call the function CGPDFContextBeginPage together with CGPDFContextEndPage to delineate the page boundaries in the output. Each page must be bracketed by calls to CGPDFContextBeginPage and CGPDFContextEndPage. Quartz ignores all drawing operations performed outside a page boundary in a page-based context.
CGPDFContextBeginPage(pdfContext, NULL);

// draw square to pdf context
CGContextSetRGBFillColor(pdfContext, 1, 0, 0, 1);
CGContextFillRect(pdfContext, CGRectMake(25, 25, 50, 50));

// Calls an application-defined function to draw content to the PDF context. You supply your drawing routine here.

如何绘制 PDF 上下文？ pdfContext -> 视图上下文？

// Signals the end of a page in a page-based graphics context.
CGPDFContextEndPage(pdfContext);

// Releases the PDF context.
CGContextRelease(pdfContext);

// Releases the page dictionary.
CFRelease(pageDictionary);
CFRelease(dataPDF);
}
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1 回答 1

1

显示单页 PDF 的最简单方法是创建它的 NSImage，然后将其放入图像视图（无边界或其他）或将该图像绘制到视图边界的某个部分或全部。

如果你有一个多页的 PDF 并且想要展示它，并且有缩放控件和其他类似的功能，那么你会想要使用 PDF Kit 框架。它是 OS X SDK 的一部分；只需将它添加到 Xcode 中的目标，然后将 PDFView 添加到您的 nib 或在代码中创建一个，然后从 URL 创建一个 PDFDocument 并将 PDFDocument 交给 PDFView。

或者，您可以在快速查看预览面板中显示 PDF 。

于 2013-07-08T01:36:17.827 回答